Games like The Fidelio Incident
Games like The Fidelio Incident include Firewatch, What Remains of Edith Finch, Outer Wilds, Gone Home, and INFRA. We matched them by the tags players give The Fidelio Incident on Steam (Walking Simulator, Adventure, Indie, Singleplayer, and Exploration): closest matches first, and among equally close ones the better-known games.

Firewatch
Shared: Adventure · Walking Simulator · Singleplayer

What Remains of Edith Finch
Shared: Walking Simulator · Adventure · Story Rich

Outer Wilds
Shared: Adventure · Exploration · Great Soundtrack

Gone Home
Shared: Walking Simulator · Indie · Exploration

INFRA
Shared: Walking Simulator · Exploration · Adventure

Return of the Obra Dinn
Shared: Singleplayer · Indie · Story Rich

The Beginner's Guide
Shared: Walking Simulator · Indie · Story Rich

The Witness
Shared: Exploration · Singleplayer · Indie

The Talos Principle
Shared: First-Person · Puzzle · Singleplayer

OneShot
Shared: Indie · Great Soundtrack · Story Rich

Layers of Fear (2016)
Shared: Walking Simulator · Singleplayer · Indie

Journey
Shared: Adventure · Indie · Walking Simulator

Blue Prince
Shared: Exploration · Singleplayer · Puzzle

Chants of Sennaar
Shared: Adventure · Indie · Singleplayer

DEATH STRANDING DIRECTOR'S CUT
Shared: Walking Simulator · Story Rich · Great Soundtrack

Everybody's Gone to the Rapture
Shared: Walking Simulator · Indie · Adventure

The Vanishing of Ethan Carter
Shared: Walking Simulator · Adventure · Exploration

Valley
Shared: Adventure · Singleplayer · Indie

GRIS
Shared: Indie · Great Soundtrack · Adventure

Hollow Knight: Silksong
Shared: Indie · Great Soundtrack · Singleplayer

Riven
Shared: Adventure · Singleplayer · Exploration

Obduction
Shared: Adventure · Indie · Exploration

The Stanley Parable
Shared: Walking Simulator · Indie · First-Person

Hollow Knight
Shared: Great Soundtrack · Indie · Singleplayer